One way interactive multisubscriber communication system
US4507680A · kind A · utility
Inventor
Key dates
| Filing date | Jun 22, 1982 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Jun 22, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Interactive programming may be provided by the system (26) of the present invention which can enable both manual and automatic selection of various interactive responses from simultaneously transmitted programming on different channels. In a cable television system (20), the channels used to transmit the interactive programming are the midband channels with the selected response being treated by the system converter (26) to convert the individually selected response to a common assigned television channel frequency for ultimate reception and display on the subscriber's television (24, 22). Automatic selection may then be accomplished by the provision of a selection signal from the logic network (48) to a local oscillator (52) which, in turn, generates a beat frequency to be mixed in a mixer (54) with the various midband channel frequencies to convert the selected midband channel frequency to the assigned television channel frequency. The selection signal is either manually selected as a result of the choice or selection manually input by the subscriber via a keyboard (50) or automatically generated as a result of the pulse count value accumulated in memory (64, 65, ) based on the w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.